Near-threshold deuteron photodisintegration: An indirect determination of the Gerasimov-Drell-Hearn sum rule and forward spin polarizability ({gamma}{sub 0}) for the deuteron at low energies
- Department of Physics, Duke University, Durham, North Carolina 27708 (United States) and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-90308 (United States)
It is shown that a measurement of the analyzing power obtained with linearly polarized {gamma}-rays and an unpolarized target can provide an indirect determination of two physical quantities. These are the Gerasimov-Drell-Hearn (GDH) sum rule integrand for the deuteron and the sum rule integrand for the forward spin polarizability ({gamma}{sub 0}) near photodisintegration threshold. An analysis of data for the d({gamma}-vector,n)p reaction and other experiments is presented. A fit to the world data analyzed in this manner gives a GDH integral value of -603{+-}43{mu}b between the photodisintegration threshold and 6 MeV. This result is the first confirmation of the large contribution of the {sup 1}S{sub 0}(M1) transition predicted for the deuteron near photodisintegration threshold. In addition, a sum rule value of 3.75{+-}0.18 fm{sup 4} for {gamma}{sub 0} is obtained between photodisintegration threshold and 6 MeV. This is a first indirect confirmation of the leading-order effective field theory prediction for the forward spin-polarizability of the deuteron.
- OSTI ID:
- 21189895
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 4; Other Information: DOI: 10.1103/PhysRevC.77.044005; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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